**-l**

_{1}+ v_{1}t**and that of the particle moving in the vertical direction is given by**

**-l**. As shown in the figure the distance between the particle is given by,

_{2}+ v_{2}tThe minimum can be obtained by differentiating d with respect to t and equating it to 0. Thus,

The distance for nearest approach can be obtained by substituting the value of t in the expression for d and obtained as,

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